[#92] ⛵  Bon voyage guard. Sayanara spork!

* Requiring right libs for full `zeus rake`
Updating README and INSTALL
Remove http: from youtube image to fix ssl errors
Pulling youtube image into app
Lock Zeus to 0.13.1
[JRO] Display @name as a link to /users/name in posts
Fix bug in rendering @usernames
[#96] Notifying @mentions via email

* Create post_notification table to track who has already been emailed per post
* Create post observer and mailer
* Fix case sensitivity issues
* Ensure posts in private topics don't notify people it shouldn't
* Get tests passing on full rake
* Removing hard-coded references to thredded.com wrt incoming/outgoing emails
* Clean up markup in setup views
* Add incoming_email_host setting for site(s)
* Add extra header to post mailer for tracking outgoing email analytics
[JRO+SB] User can set preferences per messageboard

Users should be able to opt out of the notifications if they don't want.
Editing your account and preferences will allow you to do this.

* It saves your @ preferences
* Update some gems
* Rename notifiable_members to at_notifiable_members (more clear)
* Add constraint on preferences table to not allow nulls on messageboard_id
[#97] Fix overflow issue on topics edit

This closes issue #97

Thank you @russomike for the heads up
[#87] Start figuring out button focus
[#87] Fix form margin/padding
Close #85.

Pull css class for help question mark out from being nested.
Close #84

The search results page needed footer to match topics index
[#81] KB navigation fixes

When you are autofocused on a post the active post will be that
autofocused one instead of the very first one at the top. Also set a
diff color for active private topics in the topic listing. A little
puke'y looking but, whataya want.

Close #81
[JRO] Add apple touch icons. Move registration/new view to right spot. Fix youtube player image
[JRO] Upgrade rails to 3.2.11
Update regex to match https YouTube URLs in addition to http
[JRO] A little extra mobile optimization

And small bells and whistles - favicon, etc
[JRO] rake issue fix thx to @christianmadden